chemistry
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I suppose this scenario is quite possible..
- abundance of algae matter residual from last grow cycle
- Physan20 did its job and killed all algae
- leftover dead algae matter is the tan colored slime we see in pics
- it begins to cake itself everywhere with nowhere to go
- buildup on roots starts to choke them out (score one for @chemistry)
- I mistakenly blame Physan 20 for doing it’s job
- Physan20 works, but Enzymes or Beneficial Bacteria would be better solution longterm because they eat this dead matter as opposed to letting it build up?
That's it in a nut shell.